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Si II Lines in the Shell of ζ Tau

Published online by Cambridge University Press:  14 August 2015

Sara R. Heap
Sara R. Heap*
Affiliation:
Laboratory for Optical Astronomy, Goddard Space Flight Center, Greenbelt, Md., U.S.A.

Abstract

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Non-LTE strengths of Si II lines were computed in an effort to reproduce the observed strengths of Si II lines in the shell spectrum of ζ Tau. This effort was unsuccessful, probably because it assumed that the shell could be represented by a finite, plane-parallel slab. The main conclusion of this study, then, is that in order to understand the shell spectra of Be stars, a more realistic geometry must be assumed, in which the shell is represented by a thick disk.

Type
Part IV: Line Formation in Expanding Atmospheres
Information
Symposium - International Astronomical Union , Volume 70: Be and Shell Stars , 1976 , pp. 315 - 320
Copyright
Copyright © Reidel 1976 

References

Heap, S. R.: 1975, Phil. Trans. Roy. Soc. London A. 279, 371.Google Scholar
Mihalas, D. M.: 1970, Stellar Atmospheres , W. H. Freeman, San Francisco.Google Scholar